BRPI0609657A2 - transmission apparatus, transmission method, reception apparatus and reception method - Google Patents

Abstract

TRANSMISSION APPARATUS, TRANSMISSION METHOD, RECEPTION APPARATUS AND RECEPTION METHOD. The present invention relates to a transmission apparatus which attempts to improve signal quality on an uplink and downlink that performs a radio transmission of different signals simultaneously from each other on a plurality of antennas. The apparatus has a pilot multiplexing means for multiplexing a pilot channel for transmitting from each antenna in one or more of a time division multiplexing method, a frequency division multiplexing method and a time division multiplexing method. code, a data multiplexing means for time multiplexing a pilot channel and a data channel, and a means for transmitting a signal in at least one of a space division multiplexing (SDM) method; a Space Time Transmission Diversity (STTD) method.

Description

Report of the Invention Patent for "TRANSMISSION APPARATUS, TRANSMISSION METHOD, RECEIVING APPARATUS AND RECEPTION METHOD".

Technique Field

The present invention relates to radio communication, and specifically to a transmitting apparatus, a transmitting method, a receiving apparatus and a receiving method for a downlink channel.

In a third generation communication method, represented by IMT-2000 (International Mobile Telecommunications - 2000), an increase in a speed and an increase in a downlink capacity are especially demanded, and, for example, an information transmission rate. equal to or greater than 2 Mbps using a 5 MHz frequency band has been performed. However, an additional increase in baud rate, an increase in capacity and a cost reduction are required for a presented communication system. In addition, a reduction in power consumption in a mobile station is required. For example, Non-Patent Document 1 describes a technology for improving transmission quality by adopting a multiple input multiple output (MIMO) method.

Non-Patent Document 1: A. Va Zelst, "Space division multi-plexing algorithm", Proc. 10th Med. Electrotechnical Conference 2000, pp.1218-1221

Description of the Invention

Problem to be solved by the Invention

A problem to be solved by the present invention is to provide a transmit and receive apparatus and a transmit and receive method for improving signal quality on an uplink and downlink.

Ways to Solve the Problem

In accordance with the present invention, a transmission apparatus which performs a radio transmission of different signals simultaneously from each other from a plurality of antennas is used. The apparatus has a pilot multiplexing means for multiplexing a pilot channel to transmit from each antenna in one or more of a time division multi-multiplexing method, a frequency division multiplexing method and a code division multiplexing method, a data demultiplexing means for time-multiplexing the pilot channel and the data channel, and a means for transmitting a signal in at least one of a space division multiplexing (SDM) method and a time-space transmission diversity (STTD) method. ).

Advantageous Effect of the Invention

By the present invention, signal quality can be improved by uplink and downlink.

Brief Description of the Drawings

Figure 1 shows a block diagram of a MIMO multiplexing transmitter.

Figure 2 shows a state in which a positional relationship between a serial to parallel conversion part and an interleaver is changed.

Figure 3 shows a block diagram of a MIMO multiplication type receiver.

Figure 4 shows a block diagram of a MIMO diversity pattern transmitter.

Figure 5 shows a block diagram of a MIMO diversity type receiver.

Figure 6 illustrates the operation of a MIMO diversity method.

Figure 7 shows a conceptual diagram of a method of a combination of a MIMO multiplexing method and the MIMO diversity method.

Figure 8 shows a conceptual diagram of a case where a signal is transmitted from a single antenna.

Figure 9A shows an example of multiplexing for a case where a pilot channel is transmitted from a single transmit antenna.

Figure 9B shows an example of multiplexing for a case where a pilot channel is transmitted from a single transmit antenna.

Figure 10A is a diagram (No. 21) showing a state in which a multiplex is performed with pilot channels transmitted by four transmission antennas being distinguished.

Figure 10B is a diagram (No. 21) showing a state in which a multiplex is performed with pilot channels transmitted by four transmission antennas being distinguished.

Figure 10C is a diagram (No. 21) showing a state in which a multiplex is performed while pilot channels transmitted by four transmission antennas are distinguished.

Figure 11A is a diagram (No. 2) showing a state in which a multiplex is performed with pilot channels transmitted by four transmission antennas being distinguished.

Figure 11B is a diagram (No. 2) showing a state in which a multiplex is performed with pilot channels transmitted by four transmission antennas being distinguished.

Figure 11C is a diagram (No. 2) showing a state in which a multiplex is performed while pilot channels transmitted by four transmission antennas are distinguished.

Figure 12A is a diagram (No. 3) showing a state in which a multiplex is performed with pilot channels transmitted by four transmission antennas being distinguished.

Figure 12B is a diagram (No. 3) showing a state in which a multiplex is performed with pilot channels transmitted by four transmission antennas being distinguished.

Figure 12C is a diagram (No. 3) showing a state in which a multiplex is performed while pilot channels transmitted by four transmission antennas are distinguished.

Description of Reference Numbers

102 turbo encoder; 104 data modulation part; 106.107 serial to parallel conversion part; 108-1 to N, 105 interleavers, 110-1 to N expanded multiplexing portions 110-1 to N; 112 part of expansion; 114 multiplexing part; 116 fast reverse Fourier transform part; 118 protection interval insert part; 122 convolution coder; 124 QPSK modulation part; 126 part serial to parallel conversion; interleavers 128-1 to N; 132 expansion part; 502-1 to N receiving antennas; 504 low noise amplifier; 506 mixer; 508 local oscillator; 510 bandpass filter; 512 automatic gain control part; 514 quadrature detector; 516 local oscillator; 518 analog to digital conversion part; 520 part of symbol timing detection; 522 deprotation interval removal part; 524 part of fast Fourier transform; 526 demultiplexer; 528 channel estimation part; 530 reverse expansion part; 532 from parallel to serial (P / S) conversion; 534 reverse expansion part; 536 deinterleaver; 538 turbo encoder; 540 Viterbi decoder; 402 transmission diversity encoding part; 52 transmission diversity decoding part; Deinterleaver;

702 data modulation part; 704 part of serial to parallel convergences; 706-1, 2 parts transmission diversity coding; 711, 712, 721, 722 broadcast antennas

Best Mode for Performing the Invention

According to one aspect of the present invention, when transmitting a signal in a MIMO method, a pilot channel is multiplexed to be transmitted by each antenna in one or more of a TDM method, an FDM method and a CDM method. The pilot channel and a data channel are time multiplexed. The signal is transmitted using one or both of a space division multiplexing (SDM) method, a space-time transmission diversity (STTD) method.

By adopting the MIMO method, it is possible to improve an information transmission rate or enhance a diversity effect, and contribute to improving signal quality. Since the pilot channel is transmitted such that it is distinguished for each antenna, it is possible to accurately estimate one channel. According to one aspect of the present invention, a pilo-to channel for transmission by each antenna is not multiplexed in a multi-method. time division multiplexing but in a frequency division multiplexing method or a code division multiplexing method. By this, even when an interval in which the number of users is accommodated by a single TTI Transmission) By not reaching the maximum number of users, resource efficiency can be improved.

According to one aspect of the present invention, a signal is transmitted in an orthogonal frequency code division multiplexing (OFCDM) method.

According to one aspect of the present invention, a serial to parallel conversion medium distributes the signal sequences for transmission to one of the antennas, and the interleaving medium changes a signal arrangement in one or more of the output signal sequences of the antenna. half serial to parallel conversion. By changing the arrangement of signals to transmit from the antenna, it is possible to improve the transmission quality.

According to one aspect of the present invention, the serial to parallel conversion means distributes the signal sequences for transmission to one of the antennas, and the interleaving means changes a signal arrangement into input signal sequences of the converting medium. -are serial to parallel. Hereby it is possible to change the arrangement of signals between the plurality of antennas, and thus, it is possible to obtain a large interleaving effect.

According to one aspect of the present invention, when receiving a signal from a MIMO-type receiver, a pilot channel and a data signal which have been time multiplexed are separated, and a pilot channel for each transmitting antenna, which has been multiplexed in one or more of the time multiplexing, frequency multiplexing and code multiplexing methods, is separated. A control channel is demodulated either in a demodulation method for a signal which has been transmitted by a single antenna, or in a space-time transmission diversity (STTD) method. This enables you to quickly demodulate the control channel of any of the new and old base stations.

Mode 1

Mimo Multiplexing

Figure 1 shows a block diagram of a MIMO type transmitter applicable in a first embodiment of the present invention. A MIMO multiplexing method is also called a MIMO space division multi-plexion (MIMO-SDM) method. Such a transmitter is typically provided on a base station. However, this can be provided on a mobile station. The transmitter applied in the present embodiment is a transmitter of an Orthogonal Frequency Code Division Multiplexing (OFCDM) method. However, in another embodiment, another method may be applied. The transmitter has a turbo encoder 102, a data modulation part 104, a serial to parallel conversion part 106, interleavers 108-1 to 108-N, the number of which is the same as the number (NTx> 1) of transmission antennas, and expanded multiplexing portions 110-1 to N, the number of which is the same as the number of transmission antennas. The expanded multiplication parts have the same configurations and functions, and thus the first will be described as a typical one. The expanded multiplexing portion 110-1 has an expansion portion 112, a multiplexing portion 114, a fast reverse Fourier transform portion 116, a buffer interval insert portion 118, and an expansion portion 132. Still, the transmitter has a convolution encoder 122, a modulation part of QPSK 124, a serial to parallel conversion part 126, and interleavers 128-1 to N, the number of which is the same as the number of transmit antennas.

The turbo encoder 102 performs encoding to improve error resistance over a data channel to be transmitted.

Data modulation part 104 modulates the data channel in a suitable modulation method such as QPSK, 16QAM, 64QAM or the like. When adaptive modulation and coding is applied, the modulation method is appropriately changed.

Serial to parallel (S / P) conversion part 106 converts the sequences (flow) of serial signals into parallel signal sequences. Parallel signal sequences can be determined according to the number of transmit antennas and the number of subcarriers.

Interleavers 108-1 through N change the arrangement orders of the data channels according to a predetermined pattern. The changed array order is performed for each antenna in the example shown in the figure.

Expanded multiplexing parts 1.10-1 through N process data channels for the respective antennas and output the baseband OCDCDM symbols, respectively, expansion part 112 performs code expansion by multiplying each of the following. - parallel signal frequencies by a predetermined expansion code.

In the present embodiment, a two-dimensional expansion is performed, and thus the signals are expanded in a time direction and / or a frequency direction.

The same processing is also performed on the control channels. The convolution encoder 122 performs encoding to improve the control information data error resistance. QPSK modulator 124 modulates the control channel in a QPSK modulation method. Although any appropriate modulation method may be applied, the QPSK modulation method which has a small number of modulation levels is adopted in the present modality since the amount of control information data information is relatively small. The serial to parallel (S / P) conversion portion 126 converts the serial signal sequences into parallel signal sequences. Parallel signal sequences can be determined according to the number of subcarriers and the number of transmit antennas. Interleavers 128-1 through N change the ordering arrangements of the control channels according to a predetermined pattern. The expansion portion 132 multiplies each of the parallel signal sequences by a predetermined expansion code to perform code expansion.

Multiplexing part 114 multiplexes the expanded data channels with the expanded control channels. Multiplexing can be any of a time multiplexing, frequency-multiplexing, and code multiplexing method. In the present embodiment, a pilot channel is inserted into the multiplexing portion 114, and is also multiplexed. In another embodiment, as shown by a dashed arrow, a pilo-to channel may be inserted into the serial to parallel conversion portion 106 or 126, and the Pilot channel can be multiplexed with the data channel or the control channel. The fast reverse Fourier transform portion 116 performs a fast reverse Fourier transform on an input signal, and performs OFDM modulation. The protection interval insertion part 118 adds a protection interval to the modulated signal, and thus creates a symbol in the OFDM method. As is well known, the protection range is achieved by duplicating an upper or lower part of the symbol to be transmitted.

It is noted that the positional relationships between the serial to parallel conversion parts and the interleavers (106 and 108, and 126 and 128) can be changed as shown in Figure 2. In the example shown in Figure 1, the respective interleavers perform an interleaving after the S / P separates the signal to the respective antennas. Thus, the change of position is performed within a range of the signal to be transmitted by the single antenna. In contrast to this, in the configuration shown in Figure 2, the change in arrangement by interleaver 107 also influences antenna plurality. Thus, a greater interleaving effect can be expected.

The data channel is encoded by the turbo encoder 102 of Figure 1, is modulated by the data modulation part 104, and converted into a parallel form by the serial to parallel conversion part 106, rearranged by the interleaver 108, and expanded to respective subcarrier components by the expansion part 112. In the same mode, the control channels are encoded, modulated, converted to a parallel shape, interleaved, and expanded to the respective subcarrier components. After being expanded, the data channels and control channels are multiplexed by the multiplexing part 114 to the respective carriers, are modulated in OFDM by the fast reverse Fourier transform part 116, the protection intervals are added to the modulated signals, and baseband OFCDM symbols are output to the respective antennas. The baseband signal is converted to an analog signal, is orthogonally modulated by the orthogonal modulator 402 of an RF processing portion, is appropriately amplified after being bandwidth limited, and is transmitted by radio from each antenna, in this case from each antenna, A different signal is transmitted simultaneously by the same radio feature. The radio feature can be distinguished by at least one of time, frequency and code. Thus, it is possible to increase an information transmission rate in proportion to the number of transmission times. In order to receive, demodulate and decode the signals thus transmitted, a receiving side (typically a mobile station) must comprise at least the number of transmit antennas (the number of transmit data sequences).

Figure 3 shows a block diagram of a receiver applicable to the embodiment of the present invention. The receiver is typically provided with a base station. However, this may be provided on a mobile station. The receiver has NRX (> 1) receive antennas 502-1 to Nrx, and for each antenna the receiver has a 504 low noise amplifier, a 506 mixer, a local oscillator 508, a bandpass filter 510, a automatic gain control part 512, a quadrature detector 514, a local oscillator 516, an analog to digital conversion part 518, a protective range removal part 522, a fast Fourier retransformed part 524, a demultiplexer 526, a part channel estimation 528, a reverse expansion portion 530, a parallel to serial (P / S) conversion portion 532, and a reverse expansion portion 534. As a processing element and the operation for each antenna is the same as the other, one configuration and operation for one antenna will be described as representing the others. The receiver also has a symbol timing detection part 520, a deinterleaver 356, a turbo encoder 538, and a Viterbi decoder 540.

Low noise amplifier 504 amplifies a signal, received by antenna 502, appropriately. The signal after being amplified is converted at an intermediate frequency by the mixer 506 and the local oscillator 508 symbol timing detection part (reduction conversion). The bandpass filter 510 removes the unnecessary frequency components. In the automatic gain control part 512, a gain of an amplifier is controlled such that the signal level is properly maintained. Quadrature detector 514 uses local oscillator 516 to perform orthogonal demodulation based on a phase component (I) and a quadrature component (Q). The analog to digital conversion part 518 converts the analog signal to a digital signal.

Symbol timing detection portion 520 detects the timing of a symbol (symbol limit) based on the digital signal from each antenna.

The protection interval removal part 522 removes a part corresponding to the protection interval of the received signal.

Fast Fourier transform part 524 performs a fast Fourier transform on the output signal, and performs OFDM demodulation.

Demultiplexer 526 separates a pilot channel, a control channel and a data channel multiplexed into the received signal. A separation method corresponds to multiplexing on the transmission side (the content of the processing on multiplexing part 114 in Figure 1).

Channel estimation part 528 estimates a one-channel situation using the pilot channel and outputs a control signal to adjust an amplitude and a phase to compensate for decanal fluctuation. The control signal is output to each subcarrier.

Reverse expansion portion 530 performs a reverse channel expansion of data for which channel compensation has been made, for carrier-register. It is noted that the number of multiplexed codes is Cmux-

The parallel to serial (P / S) conversion part 532 converts parallel signal sequences into serial signal sequences.

Reverse expansion part 534 performs a reverse expansion over the control signal over which channel compensation has been made.

The deinterleaver 356 changes the order of a signal arrangement according to a predetermined pattern. The predetermined pattern corresponds to an inverse one of changing the arrangement in the interleaver (108 in Figure 1) on the transmission side.

The turbo encoder 538 and the Viterbi decoder 540 decode the traffic information data and control information data respectively.

A signal received by the antenna is converted to a digital signal by amplification, frequency conversion, bandwidth limitation, orthogonal demodulation, and so on into an RF receiving part. The digital signal from which the protection interval has been The demodulated signal is demodulated inOFDM by the fast Fourier transform part 524. The demodulated signal is separated into a pilot signal, a control channel and a data channel by the separation part 526. The pilot channel is inserted into the channel estimate, and the control signal to compensate for a channel fluctuation is output from it for each sub-carrier. The data channel is compensated for using the control signal, is inverse expanded to each subcarrier, and converted to a serial signal. The converted signal is changed in its arrangement by the default predetermined by the deinterleaver 536, and is decoded by the decoder turbo 538. The predetermined pattern is inverse to the interleaver pattern made by the interleaver. In the same way, the control channel is compensated in its control porosal channel fluctuation, is inverted expanded, and is decoded by the Viterbi 540 decoder. After this, a signal processing for the use of the decoded data and the control channel is executed. In this case, the respective antenna signals from the transmission side are derived from the signal received by some signal separation method. However, in order to properly demodulate and decode the received signal, the receiver must comprise at least the Ntx number of the transmit antennas (the number of transmission sequences).

As the signal separation method, for example, an explosion method, an MMSE method, and an MLD method, or the like, may be used. The burst method is such that a receive level is measured for each transmit antenna, a decoding and a decision are made in order from a transmit signal that has the maximum level, an interference signal (interference replica) is estimated, and the interference replication is subtracted from the received signal so that the transmission signals are estimated in sequence. The minimum mean quadratic error (MMSE) method is such that, based on a channel gain of a transmit antenna, an MMSE weight is derived, and the received signals are weighted and combined so that the transmit signals are obtained. . The maximum probability detection (MLD) method is such that a channel gain of each transmit antenna is estimated, and a modulated candidate, whereby an average squared error between the modulated transmit data candidate and the received signal can be minimized, is selected and thus the transmission signals are estimated.

In the present invention, these methods or other signal separation method may be applied.

Pampering Diversity

Figure 4 shows a block diagram of a MIMO diversity pattern transmitter. The same reference numbers are given to elements for which a description has been made for Figure 1, and duplicate description for them will be omitted. In Figure 4, a transmission diversity coding part 402 is shown between an interleaver 108 and a code multiplexing part 110. The transmission diversity decoding part 402 adjusts signal content, order and the like so that transmitted signals of their transmission antennas have a mutually predetermined correspondence relationship. The transmission diversity encoding part 402 may also be referred to as a time-space transmission diversity processing part or an STTD encoder.

Figure 5 shows a block diagram of a MIMO diversity type receiver. Elements that have been described with reference to Figure 3 are given the same reference numerals, and their duplicate description will be omitted. In Figure 5, a transmission diversity decoding part 52, and a deinterleaver 54 are shown. The transmission diversity decoding part 52 separates a signal from each transmission antenna from a received signal based on an inverse expanded received signal and a channel estimation result. An expansion method is determined depending on the processing content performed on the transmission diversity coding portion on the transmission side. The deinterleaver 54 rearranges the decoded signal to a predetermined order. The predetermined order corresponds to a pattern, inverse to the order in which the transmission side interleaver did.

Figure 6 shows the content around the signal processing performed by the transmitter of Figure 4. For simplicity, it is assumed that a sequence of four symbols denoted by Si, S2, S3 and S4 are inserted into the turbo encoder 102 at sequence, as data channels. The transmit antenna number is assumed to be 2 (Njx = 2). As shown, from the first transmit antenna, same as the sequence of symbols than the one inserted into the encoder, the four symbols Si, S2, S3 and S4 are transmitted in sequence. From the second transmit antenna, symbols such as -S2 *, S4, -S4 * and S3 * are transmitted in sequence. The symbol "-" denotes a sign -, and the superscript symbol "*" denotes a conjugate complex. The STTD 402 encoder separates the sequence from Si, S2, S3 and S4 and the sequence from -S2 *, Si *, -S4 * and S3 * from the inserted sequence, and provides them with the processing parts for the respective transmit antennas. are. Therefore, the transmitter radio transmits a signal expressed by SrS2 * at the time of ti-t2) radio transmits a signal expressed by S2 + Si * at the time of t2-t3, radio transmits a signal expressed by S3-S4 * at time det3-t4, transmits a signal expressed by S4 + S3 * at time t4-t5, and thereafter transmits the same combined signals. In response to this, the receiver first receives a signal expressed by R ^ SrS ^, then receives a signal expressed by R2 = S2-Si *, then receives a signal expressed by a signal R3 = S3-S4 *, then receives a signal. expressed by a signal R4 = S4 + S3 *, and after that, receives the same signals. The transmission diversity decoding part 52 obtains the transmitted symbols Si and S2 with relational expression Ri = SrS2 * and in the relational expression R2 = S2 + Si *. These relational expressions must be previously understood in the receiver as expressions. predetermined relational relationships.

S1 = (R1 + R2 *) / 2S2 = (-Ri * + R2) 12

Similarly, based on the received signals R3 and R4, the transmitted symbols S3 and S4 can be obtained.

In the example shown in Figure 6, for simplicity, the predetermined match ratio is given for the two transmit symbols, which are then transmitted, and the receiving side obtains transmitter symbols based on the correspondence relationship. However, more commonly, some relationship may be given to transmission symbols of more than two. Even when any correspondence relationship is adopted, information having substantially the same content must be transmitted from more than two transmitting antennas during a fixed interval (in the example described above, both first and second antennas, the information substantially similar to Si , S2, S3 and S4 are transmitted during the interval of trt5). Thus, in the transmission diversity method, the information transmission efficiency does not increase. However, the diversity effect increases as the number of transmit antennas increases, and thus, an improvement in signal quality and / or a reduction in the required transmit power can be achieved. As a result, it is possible to reduce an interference level, which is caused to the surrounding cells, thus resulting in a contribution to increasing system capacity. However, the receiver must first understand, prior to demodulation, that a relationship exists. between the transmitted symbols beyond the number of transmit antennas.

Figure 7 shows a conceptual diagram of a system in which the MIMO multiplexing method and the MIMO diversity method are combined. In Figure 7, a data modulation part 702, a serial to parallel convergence part 704, a first transmission diversity part 706-1, a second transmission diversity part 706-2, and transmission antennas. 711 through 722, are shown.

Transmission modulation part 702 corresponds to data modulation parts 104 in figures 1 and 4, and serial to parallel conversion part 704 corresponds to serial to parallel conversion parts 106 and so on to figures 1 and 4.

Each of the first and second transmission diversity parts 706-1 and 2 respectively has a configuration and function same as those of the transmission diversity coding part of Figure 4.

In operation, a data channel modulated by the data modulation part 702 is separated into mutually different sequences by the serial to parallel conversion part 704, and are respectively inserted into the first and second transmission diversity coding parts 706-6. 1 and 2. For example, assuming that the modulated side sequence is Sl S2, S3 and S4, Si and S2 can be inserted into the first transmission diversity part 706-1, while S3 and S4 can be entered. inserted into the second transmission diversity portion 706-2. The first transmission diversity part 706-1 duplicates the inserted symbols, creates two symbol sequences that have a predetermined match relationship, and transmits them from the transmission antennas, respectively. For example, from the first transmit antenna 711, Si and S2 are transmitted by radio in sequence, while from the second transmit antenna 712, -S2 * and S1 * are transmitted by radio in sequence. In the same way, the second transmission diversity portion 706-2 also duplicates the inserted symbols, creates two symbol sequences having a predetermined match relationship, and transmits them from the transmit antennas, respectively. For example, from the first transmit antenna 721, S3 and S4 are transmitted by radio in sequence, whereas from the second transmit antenna 722, -S4 * and S3 * are transmitted by radio in sequence. As a result, the transmitter radio S1-S2 * + S3-S4 * first, and in the subsequent time radio S2 + S1 * + S4 * + S3 *.

A receiver first receives R1 = S1-S2 * + S3-S4 *, and subsequently receives R2 = S2 + Si * + S4 + S3 *. The receiver performs some signal separation method based on the first received signal Ri, and estimates a group of symbols transmitted by the four transmit antennas. As a result, an estimate can be made such that, in the first time, S1, -S2 *, S3 and -S4 * were transmitted from the four transmit antennas respectively. In addition, the receiver performs some signal separation method based on the second received signal R2, and estimates a group of symbols transmitted by the four transmit antennas. As a result, an estimate can be made such that, at a subsequent time, a fact that S2, S1 *, S4 * and S3 * were transmitted from the four transmit antennas respectively. These two groups of symbols are substantially the same as each other (merely, the signals are different or whether it is a complex conjugate or not), the receiver can estimate the four symbols S1, S2, S3 and S4 with high accuracy with these. The number of transmission antennas, the number of parallel signal sequences, the diversity coding method, and so on, can be changed variously from those mentioned above.

Using the MIMO multiplexing method, the MIMO diversity method, and the combination method described above, multiple channels can be transmitted via an uplink or downlink. However, especially for downlink, an increase in capacity, an increase in speed and an increase in quality are required. Pelodownlink, (D1) a common control channel, (D2) an associated control channel, (D3) a shared packet data channel, and (D4) a dedicated packet data channel are transmitted as channels that include traffic data. . By uplink, (U1) a common control channel, (U2) an associated control channel, (U3) a shared packet data channel, and (U4) a dedicated packet data channel are transmitted as channels that include data from traffic. By downlink and uplink, pilo-to channels, which do not include traffic data, are also transmitted as required. Pilot channels include known signals which are previously known to the transmission side and the receiving side, and specifically are used for channel estimation or the like.

(D1) The common downlink control channel includes a broadcast control channel (BCH), a paging channel (PCH), and a downlink access channel (FACH). The common control channel includes control information regarding the processing of a relatively high layer such as connection determination, call control or the like.

(D2) The associated control channel includes control information regarding the processing of a relatively low layer, and includes the information required to demodulate the shared-packet data channel. The required information may include, for example, a packet number, a modulation method, a coding method, a transmit power control bit, a relay control bit, or the like.

(D3) Shared packet data channel is a high-speed radio feature shared by a plurality of users. The radio feature can be distinguished by a frequency, a code, a transmission power or the like. Radio sharing can be done in a time division multiplexing (TDM), frequency division multiplexing (FDM) and / or code division multiplexing (CDM) method. A specific mode of multiplexing will be described with reference to Figure 14. In order to perform high quality data transmission, an adaptive modulation encoding method (AMC), an automatic repeat request method (ARQ), or the like, is adopted.

(D4) Dedicated packet data channel is a radio feature specially allocated to a specific user. The radio feature can be distinguished by a frequency, a code, a transmission power or the like. In order to perform high quality data transmission, the adaptive modulation and coding (AMC) method, automatic repeat request method (ARQ), or the like, is adopted.

(U1) The common uplink control channel includes a random access channel (RACH) and a backup channel (RCH). The common control channel includes control information for a relatively high layer such as connection determination, call control, or the like.

(U2) The associated channel includes the control information relating to the processing of a relatively low layer, and includes the information required to demodulate the shared packet data channel. The required information may include, for example, a packet number, a modulation method, a coding method, a transmit power control bit, a retransmission control bit, or the like.

(U3) Shared packet data channel is a high-speed radio feature shared by a plurality of users. The radio feature can be distinguished by a frequency, a code, a transmission power or the like. Radio feature sharing can be done in a time division multiplexing (TDM), frequency division multiplexing (FDM), and / or code division demultiplexing (CDM) method.

(U4) Dedicated packet data channel is a radio feature specially allocated for a specific user. The radio feature can be distinguished by a frequency, a code, a transmission power or the like. In order to perform high quality data transmission, the adaptive modulation and coding (AMC) method, automatic repeat request method (ARQ), or the like is adopted.

Downlink Transmission

Below, a method of transmitting to each channel via a downlink will be described. Since the common control channel includes broadcasting information such as a cell number, it must be received by all mobile stations. In order to easily meet the specification, the common control channel may be transmitted from a single signal transmitting antenna among a plurality of transmitting antennas at the base station, as shown in Figure 8. In this case, the other transmission antennas are not used to broadcast this channel. As described above, in order to properly demodulate a transmitted signal in the MIMO multiplexing method or in the MI-MO diversity method, additional information such as the number of transmit antennas is required. However, when transmission is made by a single transmission antenna, such information is not required, and demodulation may be done from a received signal immediately. On the one hand, the common control signal includes call control information, so it is required that communication be done positively rather than communication at a high speed. From this point of view, it is preferable that additional information such as the number of transmitting antennas or the like be provided to the mobile station by some method, and the common control channel is transmitted in the MIMO diversity method.

In the same way for the associated control channel, one of a plurality of transmit antennas may be used to transmit it, or it may be transmitted in the MIMO diversity method. Alternatively, the same content may be simultaneously transmitted from a plurality of transmission antennas. In the same way for the data channel, one of a plurality of transmit antennas may be used to transmit it, or it may be transmitted in the MIMO diversity method. The data channel is transmitted from the base station in such a way as to match the capacity of the mobile station under a condition in which a connection has been established. Therefore, the data channel may be transmitted in the MIMO multiplexing method, or in the combination method of the MIMO diversity method and the MIMO multiplexing method. The baud rate can be improved by using at least part of the MIMO multiplexing method.

Uplink and Downlink Transmission and Reception

The mobile station obtains information on the number of transmit antennas, the methods of multichannel transmission, and so on, based on the common control channel received. When the common control channel has been transmitted from a single transmit antenna, the mobile station may immediately demodulate the received common control channel. Hereby the contents of BCH, PCH and FACH can be understood. The mobile station uses the common uplink control channel (RACH) to transmit to the base station information about the mobile station's capacity (the number of receive antennas, the number of transmit antennas, and so on). ), a required service (transmission rate required), and so on. The base station uses the common downlink control channel (FACH) to notify the mobile station of a transmission method (the number of transmit antennas or similar) to the associated control channel. A data channel transmission method may be notified to the mobile station using the common control channel (FACH), or it may be notified to the mobile station using the associated control channel. In the latter case, in addition to information concerning a modulation method and an encoding factor for a transmission slice of each mobile station, a transmission method (the MIMO multiplexing method, the MIMO diversity method, the method of its combination) is notified to the mobile station.

Next, the case where the common control channel was transmitted using the MIMO diversity method will be discussed. In this case, it is assumed that a coding method of the MIMO diversity method (for example, the number of transmit antennas is two, and a signal is transmitted by the processing content shown in figure 6). It is known from the mobile station. When all base stations transmit on the same MIMO diversity method, the mobile station may proceed with signal processing the same as above by extracting necessary information from the common control channel received in such a prior arrangement. However, a base station The old type which has only one transmit antenna can exist in a district. In such a case, a signal cannot be satisfactorily demodulated in the MIMO diversity method. The mobile station according to the present embodiment attempts to de-modulate the common control channel in both of two methods. One of two methods is a demodulation method for a case where the common control channel is transmitted from a single transmit antenna. The other is a demodulation method for a case where it is transmitted in the MIMO diversity method. The necessary information is extracted from a channel which has been satisfactorily demodulated from one of these two methods. A demodulation order in both methods can be as simultaneous, or such that either can be executed first. After this, the same processing is performed. That is, the mobile station uses the common uplink control channel (RACH) to transmit the capacity information (the number of receive antennas, the number of transmit antennas, and so on) of the mobile station. , the required service (baud rate required) or the like for the base station. The base station uses the common downlink control channel (FACH) to notify the mobile station of the transmission method (the number of transmit antennas or the like) to the associated control channel to the mobile station.

Mode 2

As described above, a pilot channel is used for a channel estimate or the like. In the MIMO method, one channel is different for each transmit antenna, and thus the pilot channel must be transmitted from each transmit antenna in a distinguished mode. Therefore, when a transmitter transmits a pilot channel, a control channel, and a data channel in a multiplexed mode, the pilot channel must be distinguished for each transmitting antenna. Below, several examples concerning multi-plexing a pilot channel will be described, these are merely examples, and thus are not listed for a limiting purpose.

Figures 9A-B show an example of multiplexing where a signal is transmitted from a single transmit antenna among a plurality of transmit antennas. For the sake of simplicity, the control channel is not shown. In this case, only the single transmitting antenna transmits the signal. Figure 9A shows a state in which pilot channels and data channels are time multiplexed. Figure 9B shows a state in which a pilot channel and a data channel are frequency-multiple-xxed.

Figures 10A-C show a state (No. 21) in which the transmitted pilot channels of four transmit antennas are multiplexed in detail so that they are distinguished. Pilot channels and data channels are time multiplexed. In Figure 10A, a state is shown in which pilot channels for the four transmit antennas # 1 through # 4 are time multiplied. In Figure 10B, a state is shown in which pilot channels for the four transmit antennas are multiplexed in code. In either case, the pilot channels are successively inserted in the frequency direction, and thus, the diversity effect can be enhanced as a result of interleaving being performed in the frequency direction. Figure 10C shows a conceptual diagram of transmitted signals from the first and second transmit antennas. As shown, a state is shown in which transmitted pilot channels of the first transmitting antenna are distinguished by codes of 1, 1, 1, and 1, and pilot-transmitted channels of the second transmitting antenna are distinguished by codes of 1, 1, -1 and -1. These codes are merely examples, and any appropriate orthogonal patterns may be used.

Figures 11A-C show a state (No. 2) in which the transmitted pilot channels of four transmit antennas are multiplexed in detail so that they are distinguished. Pilot channels and data channels are time multiplexed. In Figure 11A, a state is shown in which the pilot channels for the four transmit antennas are frequency multiplexed. From a standpoint of easily and satisfactorily performing an estimate for each subcarrier, this method is preferable. In Figure 11B, a state is shown in which pilot channels for the four transmit antennas are multiplexed in code. In Figure 11C, a state is shown in which pilot channels for the four transmit antennas are frequency multiplexed and code multiplexed. Compared to the code multiplexing of the four, it is possible to shorten a code length. In either case (A), (B) and (C), it is possible to improve the information transmission efficiency by using frequency domain multiplexing. Since multiplexing is performed in the time direction in the example of Figures 10A-C, only part of the features prepared for the maximum symbol number is used when the number of symbols transmitted within a single transmission time (TTI) is small. As a result, the use of recursively effectively decays.

Figures 12A-C show a state (N-3) in which the transmitted pilot channels of four transmission antennas are multiplexed in detail so that they are distinguished. Pilot channels and data channels are time multiplexed. Figure 12A shows a state in which time multi-multiplexing is performed for each transmit antenna on the pilot channels. Figure 12B shows a state in which code multiplexing is done to transmit antenna on pilot channels. Figure 12C shows a state in which time multiplexing and code multiplexing are performed for each transmit antenna on the pilot channels. Generally speaking, a fluctuation in the time direction is small, and thus it is possible to satisfactorily maintain the orthogonality between the transmission antennas.

Preferred embodiments of the present invention have thus been described. The present invention is not limited to these, and various variations and changes may be made within the scope of the present invention. For the sake of convenience in the description, the present invention has been described in a way of being separated into some embodiments. However, separation in the respective embodiments is not a substance of the present invention, and one or more embodiments may be used as necessary.

This International application is based on Japanese Priority Application Number 2005-106910 filed April 1, 2005, the entire contents of which are hereby incorporated herein by reference.

Claims (8)

Transmission apparatus for performing a radio transmission of different signals from each other from a plurality of antennas, comprising: a pilot multiplexing means for multiplexing the pilot channels to transmit from the respective antennas, in one or more than one method. time division multiplexing, a frequency division multiplexing method and a code division multiplexing method, a data multiplexing means for time multiplexing the pilot channels and the data channels; is a means for transmitting a signal in at least one of a space division multiplexing (SDM) method and a space-time transmission diversity (STTD) method. Transmission apparatus according to claim 1, wherein: the pilot channels for transmitting from the respective antennas are multi-multiplexed, not in the time division multiplexing method but in the frequency division multiplexing method or the multiple method. -xation of code division. Transmission apparatus according to claim 1, wherein: said method for transmitting the signal performs transmission in an orthogonal frequency division code (OFCDM) method. Transmission apparatus according to claim 3, comprising: a serial to parallel conversion means for distributing the signal sequences to transmit to one of the respective antennas; and an interleaving means for changing a signal arrangement in one or more serial to parallel conversion medium output signal sequences. Transmission apparatus according to claim 3, comprising: a parallel serial conversion means for distributing the signal sequences to transmit to respective antennas; and an interleaving means for changing a signal arrangement in sequence of input signals from serial to parallel conversion medium. Receiving apparatus which receives, by a plurality of receiving signals, signals which have been transmitted by radio simultaneously: a data separation means for separating pilot channels and data signals which have been time multiplexed; pilot separation means for separating the pilot channels referring to the respective transmission antennas which have been multiple-xxed in one or more of the time multiplexing, frequencyxxing and code multiplexing methods; received signal which was transmitted by a single antenna; It is a means of demodulating a signal in a space-time transmission diversity (STTD) method. Transmission method for performing a radio transmission of different signals from each other from a plurality of antennas, comprising: multiplexing the pilot channels for transmitting from the respective antennas in one or more of a division multiplexing method. a time division multiplexing method and a code division multi-multiplexing method: time multiplexing the pilot channels and the data channels; and transmit a signal from a single antenna, or from a plurality of antennas in a space-time transmission diversity (STTD) method. Receiving method for receiving, by a plurality of receiving antennas, the signals which have been transmitted by radio simultaneously by respective signals from a plurality of transmitting antennas, comprising: separating the pilot channels and the signals of data which were multiplexed in time, separate the pilot channels for the respective transmitting antennas, which were multiplexed in one or more of the time multiplexing, frequency multiplexing and code multiplexing methods; and modulate a signal in both of such a method so as to de-modulate a received signal which has been transmitted from a single antenna, and a time-space transmission diversity (STTD) method.